Principles of Electrical Engineering Mid - I, February - 2012

1.Transient behavior occurs in any circuit when
  • there are sudden changes of applied voltage
  • the voltage source is shorted
  • the circuit is connected or disconnected from the supply
  • all of the above happen
Answer: D
2.The parameter that cannot change instantaneously in a capacitor is
  • current
  • power
  • energy
  • voltage
Answer: D
3.When a series RL circuit is connected to a voltage V at t=0,the current passing through the inductor L at t=0 is
  • V/R
  • infinite
  • zero
  • V/L
Answer: A
4.A ramp voltage ,v(t)=100 volts,is applied to an RC series circuit with R=5kΩ and C=4 uF. The maximum output voltage across capacitor is
  • 0.2 volts
  • 2.0 volts
  • 10.0 volts
  • 50.0 volts
Answer: B
5.For a two port network to be reciprocal
  • Z11=Z22
  • y21=y22
  • h21= -h12
  • AD-BC=0
Answer: C
6.In a symmetrical reciprocal network, the characteristic impedance is given by
  • sqrt(a/D)
  • sqrt(D/c)
  • sqrt(A/D)
  • sqrt(a/c)
Answer: D
7.The value of m in m-derived filter is
  • less than zero
  • more than one
  • between zero & one
  • one
Answer: C
8.The final value theorem is used to find the
  • steady state value of system output
  • initial value of the system output
  • transient behavior of the system output
  • none of these
Answer: A
9.An ideal filter should have
  • zero attenuation in the pass band
  • infinite attenuation in the pass band
  • zero attenuation in the attenuation band
  • none of these
Answer: A
10.The real part of propagation constant of a symmetrical network are
  • Attenuation constant
  • Phase constant
  • Transfer constant
  • Image constant
Answer: A
11.The time constant of a series RL circuit is ____________.
Answer: L/R
12.The Laplace transform of a unit step function is _______.
Answer: 1/s
13.The units of attenuation are _____________.
Answer: nepers or dBs
14.If Z11=2Ω; Z12=1Ω; Z21=1Ω and Z22=3Ω, what is the determinant of admittance matrix? _________.
Answer: 1
15.The characteristic impedance (Z0T) of a T-section filter having total series and shunt impedances as Z1 and Z2 respectively is given by ____________.
Answer: sqrt((n^2/4)+Z1Z2)
16.The derivative of a step function is ______________.
Answer: an impulse function
17.The ABCD parameters of a passive two port network are related as ___________.
Answer: AD-BC=1
18.For a two port bilateral network, the three transmission parameters are given by A=6/5 ;B=17/5
and C=1/5, what is the value of D? ________.
Answer: 7/5
19.In case of a symmetrical two-port network the relationship of Y-parameters is ________.
Answer: Y11=Y22
20.The units of propagation constant of a symmetrical network are ___________.
Answer: no units